a) Obliczamy, jakim procentem liczby 72 jest liczba: 9, 4, 18, 27, 36, 72, 108 oraz 144.

$\to \frac{9}{72}=\frac{1}{8}$

Ułamek zamieniamy na procent:

$\frac{1}{{\sout{8}}^2}\cdot {\sout{100}}^{25}\%=\frac{25}{2}\%=12\frac{1}{2}\%$  

 

$\to \frac{4}{72}=\frac{1}{18}$

$\frac{1}{{\sout{18}}^9}\cdot {\sout{100}}^{50}\%=\frac{50}{9}\%=5\frac{5}{9}\%$     

 

$\to \frac{18}{72}=\frac{1}{4}$

$\frac{1}{{\sout{4}}^1}\cdot {\sout{100}}^{25}\%=25\%$

 

$\to \frac{27}{72}=\frac{3}{8}$

$\frac{3}{{\sout{8}}^2}\cdot {\sout{100}}^{25}\%=\frac{75}{2}\%=37\frac{1}{2}\%$

$\to \frac{36}{72}=\frac{1}{2}$

$\frac{1}{{\sout{2}}^1}\cdot {\sout{100}}^{50}\%=50\%$

$\to \frac{72}{72}=1$

$1\cdot 100\%=100\%$

 

$\to \frac{108}{72}=\frac{3}{2}$

$\frac{3}{{\sout{2}}^1}\cdot {\sout{100}}^{50}\%=150\%$

 

$\to \frac{144}{72}=2$

$2\cdot 100\%=200\%$

 

b) Obliczamy, jakim procentem 1 metra ( 100 cm = 1000 mm) jest:

$\to 1\text{cm}:$  

$\frac{1}{{\sout{100}}^1}\cdot {\sout{100}}^1\%=1\%$

 

$\to 15\text{cm}:$  

$\frac{15}{100}=\frac{3}{20}$

$\frac{3}{{\sout{20}}^1}\cdot {\sout{100}}^5\%=15\%$

 

$\to 90\text{cm}:$  

$\frac{90}{100}=\frac{9}{10}$

$\frac{9}{{\sout{10}}^1}\cdot {\sout{100}}^{10}\%=90\%$

 

$\to 25\text{cm}:$  

$\frac{25}{100}=\frac{1}{4}$

$\frac{1}{{\sout{4}}^1}\cdot {\sout{100}}^{25}\%=25\%$

 

$\to 50\text{cm}:$  

$\frac{50}{100}=\frac{1}{2}$

$\frac{1}{{\sout{2}}^1}\cdot {\sout{100}}^{50}\%=50\%$

 

$\to 1\text{mm}:$  

$\frac{1}{1000}$  

$\frac{1}{1000}\cdot 100\%=0,1\%$

 

c) Obliczamy, jakim procentem 1 kilometra (= 1000 m= 100 000 cm) jest:

$\to 1\text{m}:$  

$\frac{1}{1000}\cdot 100\%=0,1\%$

 

$\to 350\text{m}:$  

$\frac{350}{1000}=\frac{35}{100}$

$\frac{35}{{\sout{100}}^1}\cdot {\sout{100}}^1\%=35\%$

 

$\to 1000\text{m}:$  

$\frac{1000}{1000}=1$

$1\cdot 100\%=100$

 

$\to 840\text{m}:$  

$\frac{840}{1000}=\frac{84}{100}$

$\frac{84}{{\sout{100}}^1}\cdot {\sout{100}}^1\%=84\%$

 

$\to 100\text{m}:$  

$\frac{100}{1000}=\frac{10}{100}$

$\frac{10}{{\sout{100}}^1}\cdot {\sout{100}}^1\%=10\%$

 

$\to 1\text{cm}:$  

$\frac{1}{{\sout{100000}}^{1000}}\cdot {\sout{100}}^1\%=\frac{1}{1000}\%=0,001\%$

 

$\to 50\text{cm}:$  

$\frac{50}{100000}=\frac{5}{10000}$

$\frac{5}{{\sout{10000}}^{100}}\cdot {\sout{100}}^1\%=\frac{5}{100}\%=0,05\%$